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Over the past five years, the Iris architecture has formed the basis for demonstration systems addressing key challenges in dynamic spectrum access and cognitive radio networking. These have included: • An opportunistic dynamic spectrum access network using novel physical (PHY)-layer signaling techniques for network rendezvous and coordination • A TV white(More)
Cognitive radio-based Open Spectrum systems offer a solution to the issue of spectrum scarcity by allowing wireless networks to dynamically access spectrum while coordinating to co-exist and avoid the creation of harmful interference. However, before a practical open spectrum system may be implemented, a number of significant technical and policy challenges(More)
This paper identifies important features a cognitive radio framework should provide, namely a virtual architecture for hardware abstraction, an adaptive run-time system for managing cognition, and high level design tools for cognitive radio development. We evaluate a range of existing frameworks with respect to these, and propose a novel FPGA-based(More)
Femtocells are a promising solution to provide high coverage and high data rates inside consumer’s homes while cutting operator costs significantly. Next generation Long Term Evolution (LTE) femtocells are likely to be deployed in GSM spectrum, increasing frequency utilisation and allowing a smooth transition to LTE. This paper proposes to use a spectrum(More)
Adaptive systems are set to become more mainstream, as numerous practical applications in the communications domain emerge. FPGAs offer an ideal implementation platform, combining high performance with flexibility. While significant research has been undertaken in the area of FPGA partial reconfiguration, it has focussed primarily on low-level(More)
Cognitive radio is a promising technology for fulfilling the spectrum and service requirements of future wireless communication systems. Real experimentation is a key factor for driving research forward. However, the experimentation testbeds available today are cumbersome to use, require detailed platform knowledge, and often lack high level design methods(More)
Measured antenna responses, namely their beam patterns with respect to the vertical and horizontal polarizations, play a major role in realistic wireless channel modelling as well as in parameter estimation techniques. The representations commonly used suffer from drawbacks introduced by the spherical coordinate system which is affected by two knots at the(More)
This paper describes the acceleration of a MonteCarlo algorithm for pricing a LIBOR swaption portfolio using multi-core CPUs and GPUs. Speedups of up to 305x are achieved on two Nvidia Tesla M2050 GPUs and up to 20.8x on two Intel Xeon E5620 CPUs, compared to a sequential CPU implementation. This performance is achieved by using the Xcelerit platform -(More)
The focus of this paper is an experimentation platform known as Iris that has a runtime reconfigurable software radio at its core. We have employed this platform to enable a wide variety of tests and experimentation in the fields of dynamic spectrum access and cognitive radio. The paper charts the progress of the Iris system since its inception as well as(More)
This paper presents three reconfigurable radio systems developed within CTVR, The Telecommunications Research Centre and demonstrated at the IEEE International Dynamic Spectrum Access Networks (DySPAN) symposium held in Chicago in October 2008. All three systems were developed using the Iris cognitive radio network architecture. Each system employs a(More)